POSTMAN,REST,JSON - json

Question

Json Data
[
{
"city":["Abbeville","Addamsville"],
"state":"Alabama",
"country":"US"
},
{
"city":["Batsville","ciarsville"],
"state":"Alaska",
"country":"US"
}
]
This is my Json Data and when iam posting this data in Postman to hit to my java service and created a POJO to the JSON as below,but it was throwing exception as
org.springframework.web.servlet.mvc.support.DefaultHandlerExceptionResolver
Failed to read HTTP message:
org.springframework.http.converter.HttpMessageNotReadableException: Could
not read document: Can not deserialize instance of
com.js.agtools.domain.Cities out of START_ARRAY token
at [Source: java.io.PushbackInputStream#23fd2bf6; line: 1, column: 1];
nested exception is com.fasterxml.jackson.databind.JsonMappingException: Can
not deserialize instance of com.js.agtools.domain.Cities out of START_ARRAY
token.
Cities.java
package com.js.agtools.domain;
import java.util.List;
import org.springframework.data.annotation.Id;
import org.springframework.data.mongodb.core.mapping.Document;
import com.fasterxml.jackson.annotation.JsonProperty;
public class Cities {
#JsonProperty("city")
private List<String> city;
#JsonProperty("state")
private String state;
#JsonProperty("country")
private String country;
#JsonProperty("city")
public List<String> getCity() {
return city;
}
#JsonProperty("city")
public void setCity(List<String> city) {
this.city = city;
}
#JsonProperty("state")
public String getState() {
return state;
}
#JsonProperty("state")
public void setState(String state) {
this.state = state;
}
#JsonProperty("country")
public String getCountry() {
return country;
}
#JsonProperty("country")
public void setCountry(String country) {
this.country = country;
}
}
StateController.java
#RequestMapping(value="/states",method=RequestMethod.POST)
public ResponseEntity<?> fetchStates(#RequestBody Cities cities){
for(int i=0;i<cities.getCity().size();i++){
System.out.println(cities.getCity().get(i));
}
return new ResponseEntity<>(cities, HttpStatus.OK);
}
Please some one suggest me why iam getting this error.I am not getting a solution to this from many hours.I think iam somewhere missing something in pojo.Please some one tell me where iam doing the error.

Answer 1

Your method is expecting only one Cities object, but you are passing an array of it. Change
#RequestBody Cities cities
to
#RequestBody List<Cities> cities
if you really want an array.

Answer 2

Your JSON data is an array. and you are parsing it as a object.
You can parse it as
List<MyClass> myObjects = Arrays.asList(mapper.readValue(json, MyClass[].class))
where mapper is object of ObjectMapper class.